Txoj kev loj hlob ntawm hnav-resistant steel yeeb nkab rau X70 tuab phab ntsa submarine pipeline
Subsea pipeline yog lub ntsiab lus tseem ceeb ntawm txoj kev loj hlob thiab kev tsim cov txheej txheem ntawm offshore roj thiab roj av, thiab nws yog qhov ceev tshaj plaws, nyab xeeb tshaj plaws, kev lag luam thiab txhim khu kev qha ntawm kev thauj mus los kom tsis tu ncua thauj ntau cov roj thiab roj. Nws tau dhau los ua ib txoj hauv kev zoo ntawm kev thauj mus los siv dav hauv kev lag luam offshore roj thiab roj, thiab hu ua "lifeline" nyob rau hauv offshore roj thiab roj ntau lawm system. Txij li thaum xyoo 1954, lub tuam txhab Brown & Root tau tso lub ntiaj teb thawj cov raj xa dej hauv ntiaj teb hauv Gulf of Mexico ntawm Tebchaws Meskas hauv ntau tshaj li ib nrab xyoo pua, tag nrho qhov ntev ntawm cov raj xa dej submarine tso los ntawm cov teb chaws hauv ntiaj teb tau mus txog ntau dua 100,{{ 2}} kilometers, thiab qhov tob yog mus txog 3052 meters. Tuam Tshoj lub submarine pipeline technology tseem nyob rau hauv thawj theem, thiab muaj ib tug tej yam sib txawv nrog rau cov tsim lub teb chaws nyob rau hauv lub ntiaj teb no, muaj ntau yam teeb meem.
Marine ib puag ncig yog qhov phem dua li thaj av, piv nrog cov yeeb nkab av, Marine yeeb nkab nyob rau hauv qhov kub thiab txias, siab siab, muaj zog corrosion ua hauj lwm ib puag ncig, yog li coj mus rau hauv tus account qhov tshwj xeeb ntawm Marine pipeline kev pab cuam ib puag ncig, lub zog ntawm submarine. pipeline, tsis tshua muaj kub toughness, compressive kev ua tau zoo, qhov tseeb qhov tseeb thiab lwm yam kev ntsuas muaj nruj heev. Nyob rau hauv qhov kev pom ntawm qhov tshwj xeeb ntawm kev tso txoj kev thiab siv ib puag ncig ntawm cov raj xa dej hauv qab, cov kev txwv sab sauv thiab sab qis ntawm cov khoom ntsug thiab kab rov tav ntawm cov yeeb nkab lub cev tau muab tso rau hauv kev tsim cov raj xa dej kom zoo dua kom nws muaj zog sib npaug, thiab Marine yeeb nkab kuj xav tau. zoo plasticity thiab tej yam corrosion kuj.
Nrog rau txoj kev loj hlob ntawm kev siv roj av los ntawm ntug dej hiav txwv mus rau lub hiav txwv sib sib zog nqus, cov yeeb nkab steel yuav tsum muaj lub peev xwm loj, yog li cov hlau siv nyob rau hauv cov kav dej submarine tau tsim nyob rau hauv cov kev taw qhia ntawm phab ntsa loj thiab qib siab steel. Tam sim no, X65 steel kav tau dav siv nyob rau hauv kev tsim kho ntawm submarine pipelines nyob rau hauv Tuam Tshoj, thiab nws tau dhau los ua ib tug qauv mus txuas ntxiv mus tsim hnav-resistant steel kav rau high-zog X70 thiab siab dua qib tuab phab ntsa submarine pipelines haum rau tob- hiav txwv kev pabcuam.
Lub zog siab, siab toughness, corrosion kuj thiab yooj yim vuam yog cov kev cai ntawm submarine pipeline steel. Txhawm rau kom ua tau raws li kev tsim kho kev nyab xeeb thiab kev pabcuam ib puag ncig ntawm cov raj xa dej hauv nkoj, qhov sib xws ntawm txoj kab ntev thiab transverse lub zog thiab siab plasticity ntawm cov yeeb nkab yuav tsum tau ua. High-performance pipeline hnav-resistant steel yuav tsum yog tus yam ntxwv ntawm ultra-low carbon bainite los yog ultra-low carbon acicular ferrite qauv, kom nws muaj zog, siab toughness thiab zoo welding adaptability nyob rau tib lub sij hawm muaj siab dynamic tsim kua muag. Ntshiab steel smelting tshuab xws li ultra-low S thiab Ca kev kho mob yuav tsum tau nyob rau hauv cov txheej txheem steelmaking. Hauv kev kub dov, tswj dov thiab tswj cov txheej txheem cua txias yog siv kom tau txais cov qauv ntshiab thiab zoo li acicular ferrite.
Raws li cov txheej txheem ntawm cov kav dej steel rau cov kav dej sib sib zog nqus hauv South Tuam Tshoj Hiav Txwv, cov kws tshawb fawb tau tsim cov phab ntsa tuab X70 steel qib Φ765.2mm × 31.8mm hnav-resistant steel yeeb nkab rau submarine pipelines. Los ntawm kev ntsuam xyuas cov yeeb nkab steel, qhov ntev thiab kev sib hloov lub zog ntawm cov yeeb nkab steel lub cev yog ntau dua los yog sib npaug rau 550MPa, lub zog tensile siab dua los yog sib npaug rau 660MPa, qhov tsawg kawg nkaus yield ratio yog 0.81, lub zog tensile ntawm lub vuam yog 695MPa, cov qauv elongation yog 7.6%, thiab elongation tom qab tawg yog 54%. Ntawm -20 degree, qhov nruab nrab qhov cuam tshuam lub zog ntawm cov yeeb nkab lub cev yog 340J, thiab qhov nruab nrab cuam tshuam lub zog ntawm qhov sib txuas yog 168J. Ntawm 0 degree, qhov siab tshaj plaws CTOD tus yam ntxwv tus nqi δm ncav cuag 0.688mm, qhov tsawg kawg nkaus welded sib koom yog 0.222mm, thiab qhov tsawg kawg nkaus kub cuam tshuam cheeb tsam yog 0.280mm. Cov khoom ntawm kev tiv thaiv hydrogen cracking, sulfide kev nyuaj siab corrosion thiab ntsev tsuag corrosion yog zoo nyob rau hauv lub hauv paus khoom, tshav kub cuam tshuam cheeb tsam thiab weld. Cov txiaj ntsig kev sim qhia tau hais tias X70 steel yeeb nkab muaj cov khoom zoo ntawm cov yas muaj zog, tsis tshua muaj kub toughness, tawg toughness thiab corrosion kuj, thiab yog haum rau roj thiab roj tsheb thauj mus los hauv Marine kev pab cuam ib puag ncig.
